Rebel Wilson So Long, Fat Amy!!! ... Flaunts Fit New Look

Rebel Wilson's gonna make it hard for "Pitch Perfect 4" (y'know it's gonna happen) producers to cast her as Fat Amy again, because she's shedding some serious weight.

The "Cats" star -- sorry, we had to mention that -- has been focused on her health and weight-loss for awhile now, and these new images of her putting in work at the gym ... show the progress is real in 2020.

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Rebel's been sharing her progress for the last 10 months, and even credits the filming of "Cats" for aiding her weight loss. So, there IS a silver lining to that disaster.

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On January 2 she put herself all the way out there, saying ... "Okay so for me 2020 is going to be called “The Year of Health.” Rebel vowed to get exercise and avoid sugar and junk food and added, "Who’s with me in making some positive changes this year?"

Looks like Wilson's sticking to her plan so far, and her “transformation trainer,” Jono Castano, says she's been doing it 7 days a week.

We know it's barely 3 weeks, but kudos to Rebel -- that's forever in New Year's resolutions time.

Kumail Nanjiani Intense Workout Vid ... How I Got Shredded for 'Eternals'!!!

Kumail Nanjiani
PUMPIN' IRON

Kumail Nanjiani walked into his workout regimen for "Eternals" as one big softy and emerged totally yolked thanks to high-intensity training, and a major focus on 2 key body parts.

Check out these workout videos of Kumail pumping iron with Grant Roberts ... the celeb trainer tells TMZ Kumail's transformation from scrawny to sculpted was all about intensity, and they trained for a little over an hour a day, 5 times a week for 10 months.

Kumail hit every body part training with Grant, but we're told the actor needed the most work on his shoulder and biceps, which were physically lacking when he started hitting the gym back in January -- Grant's words, not ours.

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As you know, Kumail's super proud of his new look for the upcoming Marvel movie. He just pulled the curtain back on his transformation, showing off his guns and ripped torso.

Kumail's trainer tells us they did all the muscle sculpting with dumbbells -- raising sets and overhead pressings in every angle imaginable -- and that's where most of his energy went.

TMZ Fit Club -- How to Not Get Fat on Thanksgiving!

Stuff your turkey -- not yourself -- on Thanksgiving by using a few of TMZ's healthy turkey day recipes ... which we were even kind enough to show you how to cook. Bon appeitit!

**Please cook at your own risk**

TMZ Live: Oksana, Kim K, and Rachel Uchitel

We took your questions on everything -- including video of Oksana Grigorieva describing the night Mel allegedly pulled a gun on her and baby Lucia, Kim Kardashian getting a drink poured on her, and Rachel Uchitel claiming her recovery center kept her $11,000 watch.

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Plus: Harvey gives some more TMZ Fit Club tips.

TMZ Live: Handler, Braxton, and the Miami Heat

We took your questions today on everything -- including Chelsea Handler Tweeting that her date with 50 Cent was just business, the Miami Heat going to the gun range, and singer Toni Braxton going bankrupt ... again.

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Plus: Tyler steps in for a little fantasy football talk.